# Cosmic Information, the Cosmological Constant and the Amplitude of primordial perturbations

## TL;DR

This paper proposes a holistic cosmological model linking the universe's late-time acceleration, the cosmological constant, and primordial perturbations through cosmic information and quantum spacetime features, testable via precision cosmology.

## Contribution

It introduces a novel framework connecting cosmic information with the cosmological constant and primordial perturbations, deriving their values from a single free parameter.

## Key findings

- The cosmological constant's value can be predicted from the model.
- The amplitude of primordial perturbations is determined by the same parameter.
- The model aligns with observed cosmological data for specific parameter choices.

## Abstract

A unique feature of gravity is its ability to control the information accessible to any specific observer. We quantify the notion of cosmic information ('CosmIn') for an eternal observer in the universe. Demanding the finiteness of CosmIn requires the universe to have a late-time accelerated expansion. Combining the introduction of CosmIn with generic features of the quantum structure of spacetime (e.g., the holographic principle), we present a holistic model for cosmology. We show that (i) the numerical value of the cosmological constant, as well as (ii) the amplitude of the primordial, scale invariant, perturbation spectrum can be determined in terms of a single free parameter, which specifies the energy scale at which the universe makes a transition from a pre-geometric phase to the classical phase. For a specific value of the parameter, we obtain the correct results for both (i) and (ii). This formalism also shows that the quantum gravitational information content of spacetime can be tested using precision cosmology.